I'm sure it's been mentioned before, but I just got my set of Staun Tire Deflators from
http://www.bluehummer.com/autide.html and they are worth every cent!!!
I'd say it takes around 1 minute to air down all 4 tires. Before it was taking me around 10 minutes to air down.
I can't recommend these enough!!!
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2003 Red H2 equipped with Tough Country Heavy Duty Armor Series Front End with Winch, Rear Bumper, Brush Guard, and Roof Rack.